MS Title Group:
Windows Server is Microsoft's solution for workgroup file, print, and communication servers, as well as for Internet content delivery. This is a user client access license (CAL) for Windows Server Standard, Enterprise, Datacenter, and Itanium.
A CAL is needed for every device or user accessing the server for using file services, printing services, remote access service, or terminal services, or any authenticated users accessing Windows Server as a Web server or an application server. For a significant number of authenticated Internet users, an external connector license is available.
This user CAL authorizes a user to access Windows Server from any device (for example, when an employee accesses the server from a computer at work and another at home). Device CALs are also available. A device CAL authorizes one computer to access Windows Server, regardless of the number of users (for example, on a shared workstation).
For additional information about the available editions of Windows Server 2003 and 2008 and the server and client licensing requirements, see the Guide to Windows Server Editions and Licensing.
This license does not require media, license keys, or setup codes.
Product restrictions can be found under Microsoft's eligibility guidelines.